﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SDAU.ZHCZ.Common
{
  
        public class LaomaPager
        {
            public static string ShowPageNavigate(int pageSize, int currentPage, int totalCount)
            {
                string redirectTo = "";
                pageSize = pageSize == 0 ? 3 : pageSize;
                var totalPages = Math.Max((totalCount + pageSize - 1) / pageSize, 1); //总页数
                var output = new StringBuilder();
                if (totalPages > 1)
                {
                    if (currentPage != 1)
                    {//处理首页连接
                        output.AppendFormat("<a class='pageLink' href='{0}?pageIndex=1&pageSize={1}'>首页</a> ", redirectTo, pageSize);
                    }
                    if (currentPage > 1)
                    {//处理上一页的连接
                        output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>上一页</a> ", redirectTo, currentPage - 1, pageSize);
                    }
                    else
                    {
                        // output.Append("<span class='pageLink'>上一页</span>");
                    }

                    output.Append(" ");
                    int currint = 5;
                    for (int i = 0; i <= 10; i++)
                    {//一共最多显示10个页码，前面5个，后面5个
                        if ((currentPage + i - currint) >= 1 && (currentPage + i - currint) <= totalPages)
                        {
                            if (currint == i)
                            {//当前页处理
                             //output.Append(string.Format("[{0}]", currentPage));
                                output.AppendFormat("<a class='cpb' href='{0}?pageIndex={1}&pageSize={2}'>{3}</a> ", redirectTo, currentPage, pageSize, currentPage);
                            }
                            else
                            {//一般页处理
                                output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>{3}</a> ", redirectTo, currentPage + i - currint, pageSize, currentPage + i - currint);
                            }
                        }
                        output.Append(" ");
                    }
                    if (currentPage < totalPages)
                    {//处理下一页的链接
                        output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>下一页</a> ", redirectTo, currentPage + 1, pageSize);
                    }
                    else
                    {
                        //output.Append("<span class='pageLink'>下一页</span>");
                    }
                    output.Append(" ");
                    if (currentPage != totalPages)
                    {
                        output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>末页</a> ", redirectTo, totalPages, pageSize);
                    }
                    output.Append(" ");
                }
                output.AppendFormat("第{0}页 / 共{1}页", currentPage, totalPages);//这个统计加不加都行
                return output.ToString();
            }
        }
    }
